<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    //1~100
    var r =   Math.random();//  0~1   包含0  但是不包含1
    var result =parseInt(r*100+1);// r*100;
    console.log(result);
    
    </script>
</html>